On Sunday 23 November 2003 16:35, Vintage Computer Festival wrote:
> I've got this 3Com OfficeConnect Dual Speed Hub 8 that is putting out
> this obnoxious hissing noise. It's loud enough to be annoying and
> add significantly to the white noise in my office. It sounds like
> the air is slowly being let out of a tire...forever. I've opened it
> up and found a capacitor with some brownish crusty stuff caked on the
> top of it. It also was bulged ever so slight at the top, as was
> another one right by it. Both are within proximity of the power
> connector. I didn't see any blackened spots on the enclosure
> indiciating that either had let out any magic smoke.
I'd replace those capacitors. Exploding caps don't have the same
visible effect as ICs or other components. I'm guessing the hissing
sound is from water in the paste/electrolyte inside the capacitors
boiling and coming out as steam.
> So the question is, what is the most likely cause for this hissing?
> I've had a device before where the capacitor was causing the hiss (or
> at least I was pretty sure). There doesn't seem to be anything else
> in there that would cause the hissing (a bunch of ICs, a couple
> couls, a couple power transistors, etc.)
>
> Any help appreciated.
Pat
--
Purdue University ITAP/RCS
Information Technology at Purdue
Research Computing and Storage
http://www.itap.purdue.edu/rcs/
Received on Sun Nov 23 2003 - 15:43:34 GMT